Dosing and weighing device and method for determining the weight of a product in a dosing and weighing device

A dosing and weighing device for bulk materials comprising:

• a housing with an inlet opening and an outlet opening for a product to be weighed and dosed;
• a weighing surface which is movable between a weighing position and a dosing position by an operating device and is operatively connected to at least one weight sensor, wherein
• in the weighing position a product flow between said inlet opening and said outlet opening is prevented and thus a weight of the product loaded on the weighing surface can be determined by the at least one weight sensor, and
• in the dosing position, the product flow between said inlet opening and said outlet opening is at least partially enabled, and
• a control unit which is designed at least for controlling the operating device and is connected to the at least one weight sensor,
• wherein means for determining a gas pressure difference between a pressure in the housing upstream, in a product flow direction, and a pressure in the housing downstream, in the product flow direction, of the weighing surface are provided, and that by the control unit the determined pressure difference is used to correct the weight determined by the weight sensor.